class_docstr: Dataclass that contains the information of a Rydberg setup.
  
  Args:
      register (list): coordinates of atoms
      interaction_coeff (float): interaction coefficient C6 from C6/(Rij)**6 term in :func:`rydberg_interaction`
code: def __add__(self, other):
      if other is not None:
          raise ValueError(
              "Cannot add two `HardwareHamiltonian` instances with an interaction term. "
              f"Obtained two instances with settings {self} and {other}. "
              "You most likely tried to add two terms generated by `qml.pulse.rydberg_interaction`"
          )
  
      return self
  
file_path: pennylane/pennylane/pulse/rydberg.py
imports: from dataclasses import dataclass
  import numpy
  import pennylane
  from pennylane.pulse import HardwareHamiltonian, HardwarePulse, drive
  from pennylane.wires import Wires
  from pennylane.pulse.hardware_hamiltonian import _reorder_parameters
label_desc: Use image node_id 2 for calling the RydbergSettings obj's underlying member method code with example usage: obj.__add__(other) and returns: self